• Added missing API docs for OxidizedDistribution.
• OxidizedDistribution.metadata now returns an
  importlib.metadata._adapters.Message instance on Python 3.10+.
• OxidizedDistribution.entry_points now calls
  importlib.metadata.EntryPoints._from_text_for on Python 3.10+.
  Previously, the implementation of this method didn't work properly on 3.10+.
• Added name property to OxidizedDistribution.
• Added _normalized_name property to OxidizedDistribution.
• PyO3 Rust crate upgraded to 0.16.5. This gets us better compatibility with
  Python 3.10.